<html><head><title>The Margolin Data files for GAMLSS</title>
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<h2>The Margolin Data files for GAMLSS</h2>


<h3>Description</h3>

<p>
margolin: Margolin et al. (1981) present data from an Ames Salmonella assay,
where y is the number of revertant colonies observed on a plate given a dose y of quinoline.
The data were subsequently analysed by Breslow (1984), Lawless (1987) and Saha and Paul (2005).
</p>


<h3>Usage</h3>

<pre>
data(margolin)
</pre>


<h3>Format</h3>

<p>
Data frames each with the following variable.
<dl>
</p>

<dt><code>y</code></dt><dd>a numeric vector showing the number of revertant colonies observed on a plate given a dose
x of quinoline.</dd>
<dt><code>x</code></dt><dd>a numeric vector showing a a dose
x of quinoline.</dd>

<p>
</dl>

<h3>Details</h3>

<p>
Data sets usefull for the GAMLSS booklet
</p>


<h3>References</h3>

<p>
Breslow, N. (1984) Extra-Poisson variation in log-linear models. <EM>Applied Statistics</EM>, <B>33</B>, 38-44.
</p>
<p>
Hand <EM>et al.</EM> (1994) <EM>A handbook of small data sets</EM>. Chapman and Hall, London.
</p>
<p>
Lawless, J.F. (1987) Negative binomial and mixed Poisson regression. <EM>The Canadian Journal of Statistics</EM>,
<B>15</B>, 209-225.
</p>
<p>
Margolin, B.H., Kaplan, N. and Zeiger, E. (1981) Statistical analysis of the Ames salmonella/microsome test.
<EM>Proceedings of the National Academy of Science</EM>, U.S.A., <B>76</B>, 3779-3783.
</p>
<p>
Saha, K. and Paul, S. (2005) Bias-Corrected Maximum Likelihood Estimator of the Negative Binomial Dispersion
Parameter.
<EM>Biometrics</EM>, <B>61</B>, 179-185
</p>


<h3>Examples</h3>

<pre>
data(margolin)
with(margolin, plot(y~x))
</pre>



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